Meeting programme - Oulu

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17.00 <strong>Meeting</strong> dinner Friday 2.10 (optional) 09.00 Ferry to Sveaborg …. back in your own time POSTER SESSION David Cornell, Åsa Pettersson, Joanna Wojtyla, Linn Karlsson, Valby van Schijndel Finding a Lost Continent Under the Kalahari Using Zircon Dating Snorri Guðbrandsson, Wolff-Boenisch, D., Gislason, S.R., Oelkers, E.H. Dissolution rates of crystalline basalt as a function of pH and temperature Vija Hodireva, Denis Korpechkov Heavy mineral assemblages in the Devonian and Quaternary deposits as kimberlite trace in Western part of the East-European platform Afsoon Moatari Kazerouni, Henrik Friis, Johan B. Svendsen Generation of Quartz in Claystone Diagenesis- Examples from the Siri Canyon, Danish North Sea Ilze Lūse, Valdis Segliņš, Agnese Stunda Illite polytype diagnostics between primary and secondary mineral phases Luca Menegon, Holger Stunitz, Erling Ravna, Kåre Kullerud, Steffen Bergh The Bed Rock Geology Group at the University of Tromsø Benedetta Periotto, Nestola F., Balic-Zunic T., Ohashi H. High-pressure systematic of NaMe3+Si2O6 pyroxenes: volume compression vs M 3+ cation radius Valby van Schijndel David H Cornell Linn Karlsson Johan R. Olsson The 300 Ma Dwyka diamictite Southern Africa Sigurjón Bödvar Thórarinsson P.M. Holm, S. Tappe, L.M. Heaman, C. Tegner, U-Pb zircon ages from the Kap Washington Volcanic Province, North Greenland -implications for the evolution of the Arctic Basin Mira Valkama An ore petrological and geochemical study of the polymetallic skarn ores at Pitkäranta
Silicate melt – fluid miscibility upon cooling in the Earth’s crust: the transition from granite to pegmatite. Maarten Aerts 1,2 , Alistair C. Hack 2 , Peter Ulmer 2 and Alan B. Thompson 2 1 Natural History Museum, Geology, University of Oslo, Norway 2 Institute for Mineralogy and Petrology, ETH Zürich, Switzerland Silicate-bearing aqueous fluids are important mass transfer agents in the Earth’s interior. In-situ observations of high-pressure, high-temperature fluid-rock interactions revealed how increasing solute contents can drive such aqueous fluids to melt-like behaviour at great depths in the Earth. For granitic systems, a continuous transition from hydrous magma to low-temperature hydrothermal solution has been postulated, but has not been reconciled by available data. Here we show experimental evidence for the stable coexistence of fully miscible peralkaline solutions with a model-granite at upper-crustal depths and temperatures down to 350°C. In strong contrast to subduction-zone environments, complete miscibility in a granite-H2O system was found to occur during cooling as opposed to heating. Such lowtemperature fluids and their phase relations are dramatically different from those of mantle and subduction zone fluids, and suggest that vastly enhanced mass transport related to supercriticality occurs along completely different thermal pathways in the crust compared to mantle. The fluids we have identified tend to dissolve wall rocks during cooling and are likely most important at the cooling margins of large intrusive complexes and at the late dying stages of granite fractionation and pegmatite petrogenesis. These experimental results indicate that the occurrence of supercritical silicate-bearing fluids is not restricted to the deep Earth and provide a possible explanation for the frequently observed causal relation between aqueous vapor saturation of granitic melt and the formation of giant crystals in granitic pegmatites.
Page 1 and 2: Nordic Mineralogical Network 4th An
Page 3 and 4: Afsoon Moatari Kazerouni poster Geo
Page 5: 4 th Annual Meeting - Nordic Minera
Page 9 and 10: Adsorption of Ni and Cu onto natura
Page 11 and 12: On the crystallization of the ultra
Page 13 and 14: Chemical provinces and melting of t
Page 15 and 16: Heavy mineral assemblages in the De
Page 17 and 18: Finding A Lost Continent Under the
Page 19 and 20: 1 Dissolution rates of crystalline
Page 21 and 22: The Bed Rock Geology Group at the U
Page 23 and 24: The 300 Ma Dwyka diamictite Souther
Page 25: An ore petrological and geochemical

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